Here are some tidbits from http://www.leg.state.or.us/ors/163.html
163.005 Criminal homicide. (1) A person commits criminal homicide if, without justification or excuse, the person
intentionally, knowingly, recklessly or with criminal negligence causes the death of another human being.
(2) “Criminal homicide” is murder, manslaughter or criminally negligent homicide.
(3) “Human being” means a person who has been born and was alive at the time of the criminal act. [1971 c.743 s.87]
163.095 “Aggravated murder” defined. As used in ORS 163.105 and this section, “aggravated murder” means murder as defined in ORS 163.115 which is committed under, or accompanied by, any of the following circumstances:
(1)(a) The defendant committed the murder pursuant to an agreement that the defendant receive money or other thing of value for committing the murder.
(b) The defendant solicited another to commit the murder and paid or agreed to pay the person money or other thing of value for committing the murder.
© The defendant committed murder after having been convicted previously in any jurisdiction of any homicide, the
elements of which constitute the crime of murder as defined in ORS 163.115 or manslaughter in the first degree as
defined in ORS 163.118.
(d) There was more than one murder victim in the same criminal episode as defined in ORS 131.505.
(e) The homicide occurred in the course of or as a result of intentional maiming or torture of the victim.
(f) The victim of the intentional homicide was a person under the age of 14 years.
163.118 Manslaughter in the first degree. (1) Criminal homicide constitutes manslaughter in the first degree when:
(a) It is committed recklessly under circumstances manifesting extreme indifference to the value of human life;
(b) It is committed intentionally by a defendant under the influence of extreme emotional disturbance as provided in
ORS 163.135, which constitutes a mitigating circumstance reducing the homicide that would otherwise be murder to
manslaughter in the first degree and need not be proved in any prosecution; or
© A person recklessly causes the death of a child under 14 years of age or a dependent person, as defined in ORS
163.205, and:
(A) The person has previously engaged in a pattern or practice of assault or torture of the victim or another child under
14 years of age or a dependent person; or
(B) The person causes the death by neglect or maltreatment, as defined in ORS 163.115.
163.125 Manslaughter in the second degree. (1) Criminal homicide constitutes manslaughter in the second degree
when:
(a) It is committed recklessly;
(b) A person intentionally causes or aids another person to commit suicide; or
© A person, with criminal negligence, causes the death of a child under 14 years of age or a dependent person, as
defined in ORS 163.205, and:
(A) The person has previously engaged in a pattern or practice of assault or torture of the victim or another child under
14 years of age or a dependent person; or
(B) The person causes the death by neglect or maltreatment, as defined in ORS 163.115.
- From the above, it looks like accidentally offing someone doesn’t necessarily even constitute manslaughter, if you weren’t reckless in doing what you did. Like, if you were driving responsibly and some (15-year-old) kid fell out of a tree onto the roadway and you ran him over. That would be simple homicide.